First few lines of this review will have no spoilers and will highlight what I liked about this drama and why I think you should try watching it.

This drama started off amazing. I loved the story until a certain point.

I loved the premise. I really did.
The actors really did an amazing job portraying their roles and special props to FL, Shibasaki Ko, for being able to embody such a complex character with such passion.
Music is so beautifully picked, suits this drama perfectly and stays in your head even after you're done watching. It felt like a wax seal on a letter, joining it all together perfectly.

The story, however, disappointed me.
Read no further if you wish to avoid spoilers.

I loved the story until the time skip, after which is became somewhat... unbelievable. First of all, no explanation was given as to how long she was "missing", but we can for a fact say that it's under a year given she turns 36 in the last episode. If we take into account how long it took for her to be able to walk on her own after such an extensive coma and how long it took for her to reach the emotional level of a high schooler, the only logical conclusion was a maximum of a few months (at best!).

How did that make the story unbelievable?

By eliminating most of the story. Her natural progress was cut so we'd be able to see her "actual", "age appropriate" progress. It was also implied that she learned everything she needed from the internet, without human contact, in a matter of months, while prior to it was unable to use a computer. And then she turns into an extreme opposite. Only to be reverted back in the matter of one episode. Which proves the fact her sped-up growth was just a way to enable the main plot to develop, while ignoring the context. How exactly does one go from being naive to ruthless to naive again so easily? Of course, she proves us that her naivete was not mere naivete, but a realistic goal given the fact how everyone seemed to achieve what they wanted in life. Suddenly, the world changed, even people she basically never met.

I personally would've loved to see her grow and learn, to see how she came to the idea that she needs no one, that everyone lies, that the entire society is fake. Explaining such complex development with "i googled it lmao" really downplays the seriousness of the situation that the main character was in. Last two episodes insisted on a happy ending and decided to cast away the pain that was building since episode one. It made it seem like the entire thing was... pointless. She didn't learn. A dose of realism that was supposed to be instilled in her by this experience ended up - not happening.